Bacterial Vaginosis (BV) — Treatment, Recurrence, and Partner Care

Bacterial vaginosis (BV) is the most common vaginal infection in women of reproductive age. For a first or occasional episode, treatment is usually straightforward. For recurrent BV, the picture is different — and this is where most women find themselves stuck in a cycle of repeat treatment that doesn’t break the pattern.

This article covers what BV is, how it’s treated for a single episode, why recurrent BV needs a different approach, and where partner treatment fits in.

What is bacterial vaginosis?

Bacterial vaginosis is a shift in the balance of bacteria in the vagina. A healthy vagina is dominated by lactobacillus bacteria, which produce lactic acid and keep the vaginal pH acidic. In BV, lactobacillus levels drop and other bacteria — including Gardnerella vaginalis, Prevotella, Mobiluncus, and others — overgrow.

The classic symptoms are:

• Thin, grey or white vaginal discharge
• A fishy odour, often more noticeable after sex or during menstruation
• Sometimes mild itching or irritation (though many women have no irritation at all)

About half of women with BV have no symptoms. It’s often picked up incidentally on a swab.

Is BV a sexually transmitted infection?

BV is not classified as a sexually transmitted infection. It can occur in women who are not sexually active. However, sexual activity can disrupt the vaginal microbiome and increase the risk of developing BV — particularly with new partners, multiple partners, or unprotected sex.

How BV is treated — first or occasional episode

For a first episode or an occasional flare-up, BV is treated with antibiotics:

• Oral metronidazole — typically a 5–7 day course
• Oral tinidazole — an alternative oral option
• Vaginal metronidazole gel — applied intravaginally
• Vaginal clindamycin cream — applied intravaginally

For most women with a one-off episode, this is enough. Symptoms usually improve within a few days, though completing the full course is important to reduce the risk of early recurrence.

Why recurrent BV needs a different approach

Recurrent BV is generally defined as three or more episodes within 12 months. Published studies report recurrence rates of up to 80% after standard antibiotic treatment — which is one of the reasons recurrent BV can be so frustrating to manage.

The reasons single-course treatment fails for recurrent cases:

• Biofilms allow bacteria to hide from antibiotics and regroup after treatment
• Low lactobacillus levels persist after antibiotic treatment, leaving the vagina vulnerable
• Underlying triggers — hormonal, lifestyle, and in some cases partner-related — haven’t been addressed

Read more about why vaginal infections keep coming back →

The Insync Medical recurrent BV protocol

At Insync Medical, recurrent BV is treated as a distinct clinical problem rather than a series of repeat infections. Our protocol works in three phases:

Phase 1 — Disrupt the biofilm

Targeted therapy to break down the biofilm shield so the bacteria can no longer hide from treatment. Without this step, even longer antibiotic courses often fail.

Phase 2 — Eradicate the overgrowth

Longer or combination antibiotic regimens, chosen based on your history and swab results. This may include extended-course antibiotics, alternating regimens, or combinations chosen to address the specific bacteria identified on testing.

Phase 3 — Restore the lactobacillus-dominant vaginal environment

Vaginal probiotics, pH support, and review of contributing factors such as hormonal status, lifestyle triggers, and antibiotic exposure. The goal is to rebuild the protective vaginal environment so future imbalances are less likely to take hold.

Partner treatment for recurrent BV

Although BV is not classified as a sexually transmitted infection, a male partner’s microbiome can influence the vaginal microbiome through skin contact and sexual activity. For some women in long-term relationships with recurrent BV, the male partner appears to be a meaningful contributor.

Emerging clinical evidence suggests that treating male partners alongside the female patient may improve cure rates in recurrent BV.

Where clinically appropriate, Insync Medical offers a clindamycin cream compounded specifically for penile skin application by the male partner. The aim is to reduce the BV-associated bacterial load on the male partner’s skin during the same treatment window as the female partner — so the vaginal microbiome isn’t re-seeded after antibiotic treatment.

Partner treatment is not appropriate in every case, and is offered after clinical assessment of both partners as part of the broader recurrent BV protocol.

Complications of untreated BV

While BV is treatable, leaving it untreated — particularly in recurrent or persistent cases — can carry some risks:

• Increased risk of acquiring sexually transmitted infections if exposed
• Complications during pregnancy, including preterm delivery
• Increased risk of infection after gynaecological procedures
• Increased risk of pelvic inflammatory disease in some cases

This is not a reason to panic if you have BV — it’s a reason to get it properly assessed and treated, particularly if it keeps coming back.

When to see a doctor about BV

See a doctor if:

• You notice a change in vaginal discharge, particularly grey or white discharge with a fishy odour
• You’ve completed over-the-counter or previously prescribed treatment and symptoms haven’t fully cleared
• You’ve had three or more BV episodes in the past 12 months
• You’re pregnant or planning pregnancy

Learn more about vaginal infection treatment at Insync Medical →

FAQs

Can BV go away on its own?
Mild BV occasionally resolves without treatment, but for most women treatment is needed to clear symptoms and reduce the risk of complications. Recurrent BV almost always needs structured treatment.

Can I get BV from my partner?
BV is not classified as an STI, but a male partner’s microbiome can influence the vaginal microbiome. In recurrent cases, partner treatment may be considered.

Why does BV keep coming back even after antibiotics?
Standard antibiotics may not disrupt biofilms or restore the protective lactobacillus environment. Recurrent BV usually requires a longer, multi-phase protocol.

Is it safe to treat BV during pregnancy?
Yes — and it’s important to do so, because untreated BV during pregnancy is associated with higher risk of complications. Treatment during pregnancy should always be doctor-supervised.

How do I know if I have BV or a yeast infection?
The discharge type and odour differ — BV typically produces thin, grey-white discharge with a fishy smell, while yeast typically produces thick, white, odourless discharge with itching. But because symptoms can overlap, a swab test is the most reliable way to know.